{"title":"Study on critical crack length of wet-sieved and full-graded concrete under mode I loading","authors":"Xingyu Zheng, Zhimin Wu, Mengdi Jia","doi":"10.1680/jmacr.23.00059","DOIUrl":null,"url":null,"abstract":"This study quantitatively compares the critical crack lengths of wet-sieved and full-graded concrete obtained from experimental measurements, the numerical simulation, with that from the analytical solution based on the linear elastic fracture mechanics formula (LEFM). The experiments are conducted on wedge-splitting specimens with depths from 200 mm to 1500 mm and a maximum aggregate size of 150 mm. Strain gauges and clip gauges are pasted and mounted along the direction of crack growth to measure the critical crack length. The numerical and analytical methods are used to calculate the critical crack length. The average relative error between the analytical calculations and measurements is still 14%, even if the specimen depth increases to 1500 mm. Additionally, the effective fracture toughness is calculated by combining the peak load and critical crack length, resulting in an average relative error of 17%. These results indicate that the existing analytical method is inadequate for determining the critical crack length. Consequently, a modified analytical method is adopted, utilizing the 95% peak load in the post-peak region and the corresponding crack mouth opening displacement (CMOD), which provides calculated results that agree well with experimental data. Furthermore, the effective fracture toughness can be reasonably derived using the critical crack lengths from the modified analytical method.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Magazine of Concrete Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1680/jmacr.23.00059","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
This study quantitatively compares the critical crack lengths of wet-sieved and full-graded concrete obtained from experimental measurements, the numerical simulation, with that from the analytical solution based on the linear elastic fracture mechanics formula (LEFM). The experiments are conducted on wedge-splitting specimens with depths from 200 mm to 1500 mm and a maximum aggregate size of 150 mm. Strain gauges and clip gauges are pasted and mounted along the direction of crack growth to measure the critical crack length. The numerical and analytical methods are used to calculate the critical crack length. The average relative error between the analytical calculations and measurements is still 14%, even if the specimen depth increases to 1500 mm. Additionally, the effective fracture toughness is calculated by combining the peak load and critical crack length, resulting in an average relative error of 17%. These results indicate that the existing analytical method is inadequate for determining the critical crack length. Consequently, a modified analytical method is adopted, utilizing the 95% peak load in the post-peak region and the corresponding crack mouth opening displacement (CMOD), which provides calculated results that agree well with experimental data. Furthermore, the effective fracture toughness can be reasonably derived using the critical crack lengths from the modified analytical method.
期刊介绍:
For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed.
Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.